INSURED MUNICIPALS INCOME TR & INVS QUA TAX EXE TR MU SER 23, 497J, 1998-07-30

INSURED MUNICIPALS INCOME TR & INVS QUA TAX EXE TR MU SER 23
497J, 1998-07-30

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                              July 30, 1998
                                    
                                    
                                    
Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.  20549-1004

Attn:  Filing Desk - Stop 1-4
     
     Re:  Insured  Municipals  Income Trust and Investors'  Quality  Tax-
          Exempt Trust, Multi-Series 23
          File No. 33-03457   CIK #789672

Ladies/Gentlemen:
     
         In accordance with the provisions of Rule 497(j) of Regulation C under
the Securities Act of 1933 (the "Securities Act") this letter serves to certify
that the most recent amendment to the subject Registration Statement on Form S-6
for the above captioned Trust does not differ from that which would have been
filed pursuant to Rule 497(b) of the Securities Act. The most recent amendment
to the the Registration Statement was filed electronically with the Commission
on July 27, 1998.

                                    Very truly yours,
                                    
                                    
                                    
                                    
                                    Van Kampen Funds Inc.